Searching for geometric molecular shape complementarity using bidimensional surface profiles
Journal of Molecular Graphics
Untraceable electronic mail, return addresses, and digital pseudonyms
Communications of the ACM
Anonymity, unobservability, and pseudeonymity — a proposal for terminology
International workshop on Designing privacy enhancing technologies: design issues in anonymity and unobservability
Aggregation and comparison of trajectories
Proceedings of the 10th ACM international symposium on Advances in geographic information systems
Location Privacy in Pervasive Computing
IEEE Pervasive Computing
Preserving Privacy in Environments with Location-Based Applications
IEEE Pervasive Computing
Shape-Based Similarity Query for Trajectory of Mobile Objects
MDM '03 Proceedings of the 4th International Conference on Mobile Data Management
k-anonymity: a model for protecting privacy
International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems
Privacy preserving route planning
Proceedings of the 2004 ACM workshop on Privacy in the electronic society
Secure Group Communications Over Data Networks
Secure Group Communications Over Data Networks
Data Obfuscation: Anonymity and Desensitization of Usable Data Sets
IEEE Security and Privacy
Location-based Services: Fundamentals and Operation
Location-based Services: Fundamentals and Operation
Anonymous Usage of Location-Based Services Through Spatial and Temporal Cloaking
Proceedings of the 1st international conference on Mobile systems, applications and services
A formal model of obfuscation and negotiation for location privacy
PERVASIVE'05 Proceedings of the Third international conference on Pervasive Computing
ACM SIGMOBILE Mobile Computing and Communications Review
A Location Privacy Aware Friend Locator
SSTD '09 Proceedings of the 11th International Symposium on Advances in Spatial and Temporal Databases
Longitude: Centralized Privacy-Preserving Computation of Users' Proximity
SDM '09 Proceedings of the 6th VLDB Workshop on Secure Data Management
Privacy preservation in the dissemination of location data
ACM SIGKDD Explorations Newsletter
The VLDB Journal — The International Journal on Very Large Data Bases
MILC: A secure and privacy-preserving mobile instant locator with chatting
Information Systems Frontiers
Private proximity detection for convex polygons
Proceedings of the 12th International ACM Workshop on Data Engineering for Wireless and Mobile Acess
Smart cities software: customized messages for mobile subscribers
WiFlex'13 Proceedings of the First international conference on Wireless Access Flexibility
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In location-based community services (LBCSs), the positions of several targets are interrelated. Users can be notified when targets approach or separate from each other. Typical application areas are instant messaging, mobile gaming, dating, fleet management and logistics, as well as child tracking. Finding appropriate anonymization techniques for LBCSs is a hard problem since (i) the targets are continuously monitored and (ii) identifiers of the targets must not change in order to maintain coherence within a community. LBCSs are inherently stateful. Therefore, existing anonymization techniques for location-based services are not suited for LBCSs. In this paper, we present an anonymization technique for LBCSs, which employs distance-preserving coordinate transformations in conjunction with pseudonyms. It is based on the idea that for determining the distance between targets only relative positions are needed. It supports target anonymity, either with respect to the location provider, which collects the position fixes, or the LBS provider. The paper also presents the results of simulations, which we have performed in order to evaluate the proposed mechanism.